<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <script src="../vue.js"></script>
</head>
<body>
<div id="app">
    {{fullName}}
</div>

<script>
    var vm=new Vue({
        el:"#app",
        data:{
            firstName:"Dell",
            lastName:"Lee"
        },
        computed:{
            fullName: {
                get:function () {
                    return this.firstName+" "+this.lastName;
                },
                set: function (value) {
                    var arr=value.split(" ");
                    this.firstName=arr[0];
                    this.lastName=arr[1];
                }
            }
        }
    })
</script>
</body>
</html>